1 Corinthians 2:13

But what is this, "comparing spiritual things with spiritual?" When a thing is spiritual and of dubious meaning, we adduce testimonies from the things which are spiritual. For instance, I say, Christ rose again-was born of a Virgin; I adduce testimonies and types and demonstrations; the abode of Jonah in the whale and his deliverance afterwards; the child-bearing of the barren, Sarah, Rebecca, and the rest; the springing up of the trees which took place in paradise when there had been no seeds sown, no rains sent down, no furrow drawn along. For the things to come were fashioned out and figured forth, as in shadow, by the former things, that these which are now might be believed when they came in. And again we shew, how of the earth was man, and how of man alone the woman; and this without any intercourse whatever; how the earth itself of nothing, the power of the Great Artificer being every where sufficient for all things. Thus "with spiritual things" do I "compare spiritual," and in no instance have I need of the Wisdom which is without-neither its reasonings nor its embellishments. For such persons do but agitate the weak understanding and confuse it; and are not able to demonstrate clearly any one of the things which they affirm, but even have the contrary effect. They rather disturb the mind and fill it with darkness and much perplexity. Wherefore he saith, "with spiritual things comparing spiritual." Seest thou how superfluous he sheweth it to be? and not only superfluous, but even hostile and injurious: for this is meant by the expressions, "lest the Cross of Christ be made of none effect," and, "that our faith should not stand in the wisdom of men." And he points out here, that it is impossible for those who confidently entrust every thing to it, to learn any useful thing.